#include<stdio.h>
int a[8];
char *day[]={	   	     	  
    "","MONDAY","TUESDAY","WEDNESDAY","THURDAY",
       "FRIDAY","STAURDAY","SUNDAY"};
main()
{	   	     	  
    int i,t,j;
    a[4]=6;
    for(i=1;i<=3;i++)
    {	   	     	  
        a[i]=2;
        if(!a[i+3])
            a[i+3]=7;
        else
        {	   	     	  
            a[i]=0;
            continue;
        }
        for(t=1;t<=3;t++)
        {	   	     	  
            if(!a[t])
                a[t]=5;
            else
                continue;
            if(!a[t+2])
                a[t+2]=4;
            else
            {	   	     	  
                a[t]=0;
                continue;
            }
            for(j=5;j<7;j++)
            {	   	     	  
                if(!a[j])
                    a[j]=3;
                else
                    continue;
                if(!a[j+1])
                    a[j+1]=1;
                else
                {	   	     	  
                    a[j]=0;
                    continue;
                }
                for(i=1;i<=7;i++)
                    printf("Doctor %c is on duty %s.\n",'A'+a[i]-1,day[i]);
                exit(0);
            }
        }
    }
}	   	   